CN216678176U - Cyclohexanone ammoximation reaction system - Google Patents

Abstract

The utility model discloses a cyclohexanone ammoximation reaction system, which comprises a reaction kettle, a metal film filter and a cooler, wherein the metal film filter is provided with a feed inlet, a clear liquid outlet and a turbid liquid outlet, the reaction kettle is connected to the feed inlet of the metal film filter through a discharge pipeline, a circulating pump is arranged on the discharge pipeline, the cyclohexanone ammoximation reaction system also comprises a stirring turbine, the turbid liquid outlet of the metal film filter is sequentially connected with the cooler, the stirring turbine and the reaction kettle through a kettle liquid return pipeline, a raw material adding pipe is also arranged on the kettle liquid return pipeline and positioned between the cooler and the stirring turbine, and a stirrer is arranged in the reaction kettle. The reaction system can fully mix turbid liquid and raw materials and has the advantage of high reaction efficiency.

Description

Cyclohexanone ammoximation reaction system

Technical Field

The utility model belongs to the field of chemical equipment, and particularly relates to a cyclohexanone ammoximation reaction system.

Background

Caprolactam (CPL) is an important organic chemical raw material, is a monomer of synthetic fibers and engineering plastics, is mainly used for producing polyamide engineering plastics and polyamide fibers, and is an important chemical raw material in short supply in the market of China. The existing caprolactam reaction system is characterized in that hydrogen peroxide, ammonia and cyclohexanone are catalyzed to react to generate cyclohexanone oxime in the presence of a titanium silicalite molecular sieve catalyst and a tert-butyl alcohol solvent, then the titanium silicalite catalyst is filtered through an external filtering system to obtain a reaction clear liquid, a series of purification methods are carried out to obtain high-purity cyclohexanone oxime, filtered turbid liquid and raw materials are mixed and then flow back to a reaction kettle for recycling, but the problem that the reaction efficiency is low due to the fact that the filtered turbid liquid and the raw materials are not uniformly mixed still exists in the existing reaction system.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a cyclohexanone ammoximation reaction system, aiming at realizing the full mixing of turbid liquid and raw materials and improving the reaction efficiency.

Therefore, the cyclohexanone ammoximation reaction system provided by the embodiment of the utility model comprises a reaction kettle, a metal film filter and a cooler, wherein the metal film filter is provided with a feeding hole, a clear liquid outlet and a turbid liquid outlet, the reaction kettle is connected to the feeding hole of the metal film filter through a discharging pipeline, a circulating pump is arranged on the discharging pipeline, the cyclohexanone ammoximation reaction system further comprises a stirring turbine, the turbid liquid outlet of the metal film filter is sequentially connected with the cooler, the stirring turbine and the reaction kettle through a kettle liquid return pipeline, a raw material adding pipe is further arranged on the kettle liquid return pipeline and between the cooler and the stirring turbine, and a stirrer is arranged in the reaction kettle.

Specifically, the parallelly connected setting of metal film filter is a plurality of, discharge pipeline divides many and a plurality of the ejection of compact branch road of metal film filter's feed inlet one-to-one intercommunication, the feed end of cauldron liquid return line divides many and a plurality of the return branch pipe of metal film filter's turbid liquid export one-to-one intercommunication all is equipped with control flap on every ejection of compact branch road and the return branch pipe.

Specifically, a clear liquid outlet of the metal membrane filter is divided into two branches, one branch is connected with a backwash liquid pipeline, the other branch is connected with a reaction product storage tank, and each branch is provided with a control valve.

Specifically, the agitator includes agitator motor, (mixing) shaft and stirring leaf, the one end of (mixing) shaft with agitator motor connects, and the other end stretches into in the reation kettle with the stirring leaf is connected.

Specifically, the metal film filter is also provided with an overhauling and cleaning opening.

Specifically, a heating element is arranged on the reaction kettle.

Specifically, the heating element is a heating pipe coiled on the reaction kettle.

Compared with the prior art, at least one embodiment of the utility model has the following beneficial effects: the stirring turbine is arranged on the kettle liquid return pipeline, so that turbine blades in the stirring turbine can be driven to rotate by using the residual water pressure, the catalyst from the metal membrane filter and the reaction raw material from the feeding pipe are subjected to primary mixing, secondary mixing of the stirrer on the reaction kettle is matched, and finally, the reaction raw material and the catalyst are fully mixed, so that the purposes of reducing reaction time and improving reaction efficiency are achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a cyclohexanone ammoximation reaction system provided by an embodiment of the present invention;

wherein: 1. a reaction kettle; 2. a metal membrane filter; 3. a cooler; 4. a stirring turbine; 5. a discharge pipeline; 6. a circulation pump; 7. a kettle liquid return line; 8. a raw material addition pipe; 9. a stirrer; 91. a stirring motor; 92. a stirring shaft; 93. stirring blades; 10. a discharging branch; 11. a return branch pipe; 12. a control valve; 13. a backwash liquid line; 14. a reaction product storage tank; 15. a heating element.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, a cyclohexanone ammoximation reaction system, including reation kettle 1, metal film filter 2, cooler 3 and stirring turbine 4, metal film filter 2 is equipped with the feed inlet, clear solution export and turbid liquid export, reation kettle 1's bottom is connected to metal film filter 2's feed inlet through discharge pipe 5, be equipped with circulating pump 6 on discharge pipe 5, the turbid liquid export of metal film filter 2 communicates with cooler 3, stirring turbine 4 and reation kettle 1's top in proper order through cauldron liquid return line 7, still be equipped with raw materials addition pipe 8 on cauldron liquid return line 7 between cooler 3 and stirring turbine 4, be equipped with agitator 9 in the reation kettle 1. The stirring turbine 4 includes a volute and a turbine blade disposed in a flow channel of the volute, and the turbine blade performs a rotation motion relative to the volute 41, which are all the prior art and are not described herein.

The reaction system with the structure works as follows: reaction raw materials enter a kettle liquid return pipeline 7 through a raw material adding pipe 8, the reaction raw materials are fully mixed with turbid liquid cooled by a cooler 3 in a stirring turbine 4 and then enter a reaction kettle 1, oximation reaction is finally carried out under the action of a catalyst, the reaction liquid after the oximation reaction enters a metal membrane filter 2 for filtration treatment under the pumping action of a circulating pump 6, the filtered reaction products are discharged from a clear liquid outlet, and the intercepted catalyst and the circulating liquid are discharged from the turbid liquid outlet and enter the reaction kettle 1 again for recycling.

In this embodiment, the stirring turbine 4 is disposed on the kettle liquid return line 7, so that the turbine blades in the stirring turbine 4 can be driven to rotate by the residual pressure of the return water, the catalyst from the metal film filter 2 and the reaction raw material from the feeding pipe are mixed for the first time, and the reaction raw material and the catalyst are fully mixed by the secondary mixing of the stirrer 9 on the reaction kettle 1, so as to achieve the purposes of reducing the reaction time and improving the reaction efficiency.

Referring to fig. 1, in some embodiments, a plurality of metal membrane filters 2 are arranged in parallel, the discharge pipeline 5 is divided into a plurality of discharge branches 10 which are in one-to-one communication with the feed inlets of the plurality of metal membrane filters 2, the feed end of the kettle liquid return pipeline 7 is divided into a plurality of return branch pipes 11 which are in one-to-one communication with the turbid liquid outlets of the plurality of metal membrane filters 2, and each discharge branch 10 and each return branch pipe 11 is provided with a control valve 12. By adopting the design, when liquid leakage occurs in a certain metal film filter 2, the metal film filter 2 can be overhauled only by closing the two control valves 12 at the two ends of the metal film filter 2, the whole reaction system can still normally work, and the maintenance without shutdown can be realized.

Referring to fig. 1, in other embodiments, the clear liquid outlet of the metal membrane filter 2 is divided into two branches, one branch is connected with a backwash liquid pipeline 13, the other branch is connected with a reaction product storage tank 14, and each branch is provided with a valve. Due to the design, when the filtering membrane pipe in the metal membrane filter 2 needs backwashing, the valve on the branch connected with the reaction product storage tank 14 is closed, and the backwashing valve of the backwashing liquid pipeline 13 is opened to start backwashing, so that the metal membrane filter 2 can be effectively prevented from being blocked. And (3) the backwashing liquid after backwashing flows out from the turbid liquid outlet and returns to the reaction kettle 1 through the kettle liquid return pipeline 7, the backwashing liquid comes from the reaction product storage tank 14, the backwashing valve is closed after backwashing is finished, and the valve on the pipeline of the reaction product storage tank 14 is opened to continue operation. As for the specific structure of the metal membrane filter 2, it is the prior art and will not be described herein.

Referring to fig. 1, specifically, the stirrer 9 includes a stirring motor 91, a stirring shaft 92 and a stirring blade 93, wherein one end of the stirring shaft 92 is connected to the stirring motor 91, and the other end extends into the reaction kettle 1 and is connected to the stirring blade 93. When raw materials in the reaction kettle 1 need to be stirred, the stirring motor 91 is started to drive the stirring shaft 92 to rotate, and then the stirring blades 93 can be utilized to fully stir the raw materials.

Referring to fig. 1, in some embodiments, a heating element 15 is disposed on a reaction vessel 1, and at an initial start-up stage of the reaction vessel 1, the heating element 15 may be used to heat materials in the reaction vessel 1, so as to improve reaction efficiency, and since an oximation reaction is a heat-generating reaction, after the reaction vessel 1 is started for a period of time, the heating element 15 stops heating, so as to save energy. Specifically, the heating element 15 may be a heating pipe wound around the reaction tank 1.

Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.

Meanwhile, if the utility model as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical aspect of the present disclosure for indicating positional relationship or shape include, unless otherwise stated, states or shapes similar, analogous or approximate thereto. Any part provided by the utility model can be assembled by a plurality of independent components or can be manufactured by an integral forming process.

Claims (8)

1. The utility model provides a cyclohexanone ammoximation reaction system, includes reation kettle (1), metal film filter (2) and cooler (3), metal film filter (2) are equipped with feed inlet, clear liquid export and turbid liquid export, reation kettle (1) is connected to through discharge tube (5) the feed inlet of metal film filter (2), be equipped with circulating pump (6) on discharge tube (5), its characterized in that: still include stirring turbine (4), the turbid liquid export of metallic membrane filter (2) pass through cauldron liquid return line (7) in proper order with cooler (3) stirring turbine (4) with reation kettle (1) is connected, lie in on cauldron liquid return line (7) cooler (3) with still be equipped with raw materials between stirring turbine (4) and add pipe (8), be equipped with agitator (9) in reation kettle (1).

2. The cyclohexanone ammoximation reaction system of claim 1, wherein: metal film filter (2) are parallelly connected to be set up a plurality ofly, discharge pipeline (5) divide many and a plurality of discharge branch (10) of the feed inlet one-to-one intercommunication of metal film filter (2), the feed end of cauldron liquid return line (7) divides many and a plurality of return branch (11) of the turbid liquid export one-to-one intercommunication of metal film filter (2), every all be equipped with control flap (12) on discharge branch (10) and return branch (11).

3. The cyclohexanone ammoximation reaction system according to claim 1 or 2, wherein: the clear liquid outlet of the metal membrane filter (2) is divided into two branches, one branch is connected with a backwash liquid pipeline (13), the other branch is connected with a reaction product storage tank (14), and each branch is provided with a valve.

4. The cyclohexanone ammoximation reaction system according to claim 1 or 2, wherein: the stirrer (9) comprises a stirring motor (91), a stirring shaft (92) and stirring blades (93), one end of the stirring shaft (92) is connected with the stirring motor (91), and the other end of the stirring shaft extends into the reaction kettle (1) and is connected with the stirring blades (93).

5. The cyclohexanone ammoximation reaction system according to claim 1 or 2, wherein: the discharge pipeline (5) is communicated with the bottom of the reaction kettle (1).

6. The cyclohexanone ammoximation reaction system according to claim 1 or 2, wherein: and a heating element (15) is arranged on the reaction kettle (1).

7. The cyclohexanone ammoximation reaction system of claim 6, wherein: the heating element (15) is a heating pipe coiled on the reaction kettle (1).

8. The cyclohexanone ammoximation reaction system according to claim 1 or 2, wherein: and the kettle liquid return pipeline (7) is communicated with the top of the reaction kettle (1).

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